but, just to know, what kind of message should i get if all the connections are ok?
You get that message in your head or maybe marked on the paper Read the main.asm.
You’re testing, if signals from core are actually going to SID socket - manually, by sending different modulation control messages and seeing if PIN voltage goes up.. (read the main asm there’s one exception) MEssages on the LCD only show which PIN is selected and you can see those pins in SID module schematics.